Page 1087 - 5G Basics - Core Network Aspects

Transport aspects 2

Appendix YY

Calculation of loop attenuation (LATN)

(This appendix does not form an integral part of this Recommendation.)

The loop attenuation is denoted as LATN. This appendix defines a common method of calculating LATN
from Hlog.
LATN is the average of the squared magnitude of H(f) , converted to dB. LATN is computed as:

 2 
  H  i ( f ) 
LATN  10 log 10  i Valid_Hlog   

  N _ V  
 

Where {Valid_Hlog} is the set of subcarriers with reported Hlog (as defined in clause 11.4.1.2.1) different
from the special value, N_V is the number of these valid subcarriers, and H(f) = 10 Hlog(f)/10 (converted to
linear values for use in the above equation). If the grouping used to report Hlog is greater than 1, (G > 1),
then in the above summation Hlog(i × Δf) is represented by Hlog(k × G × Δf) with k such that k × G is the
closest value to i.

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